TCML operate and control the 146 Km Railway line from Lake Magadi to Konza.

REQUEST OF A QUOTATION TO CARRY OUT STRUCTURAL ASSESSMENT OF BRIDGES, VIADUCT, BOX CULVERTS AND DRAINAGE STRUCTURES ON THE LAKE MAGADI AND KONZA RAILWAY LINE. Tata chemicals Magadi Limited, transport a minimum of 500,000 tonnes per annum of which 90% is soda ash from Magadi to Mombasa for export through the Port of Mombasa. The products are carried in hopper and covered wagons. The other products are fuel oil which are transported in normal fuel tank wagons from Mombasa to Magadi. TCML operate and control the 146 Km Railway line from Lake Magadi to Konza. 1. OBJECTIVES The main objective of this tender is: 1. To assess the structural suitability of all bridges, viaduct and box culverts on the railway line between Lake Magadi and Konza, bearing in mind that these structures were designed many years ago and have been in use for a long time. 2. Identify any existing condition that can restrict locomotives from operating on Magadi Railway line, 3. Suggest requirements needed to be fulfilled on these structures to enable locomotives to operate safely on the railway line. 2. SCOPE OF WORKS 1. Reconnaisance survey of all bridges, viaduct and box culverts,so as to have a basic idea of their state, 2. Carry out structural analysis (both substructure and super structure) to establish structural integrity of the following Bridges and Viaduct: Km 47..Girder bridge Km48/20..Girder bridge Km57..Viaduct Km60..Viaduct Km65..Girder bridge Km80..Girder bridge Km 139 Viaduct

3. Establish present strength of the bridges/viaducts, load bearing capacity for metre gauge track on them and assess the capacity to safely carry present fleet of locomotives at established maximum speed. 4. Assess the structural suitability and adequacy of the box culverts between Lake Magadi and Konza. 5. Suggest measures for strengthening foundations and superstructural members which might be structurally inadequate, 6. Come up with cost estimates for strengthening works of both superstructure and sub structural components of the bridges. 7. Estimate the annual maintenance cost of the bridges, 8. Recommendations. 3. BOX CULVERTS SCHEDULE DISTANCE OBSERVATIONS (KM) 145/120 Steel /timber sleepers deck channel RECOMMENDATIONS 144/785 144/143 144/536 Culvert size 1200mm diameter 143/710 Box culvert 450x450mm in twin 143/530 Culvert needed 143/250 Culvert needed 143/125 Culvert size 450mm diameter

143/020 Culvert size 600mm diameter 142/955 142/860 Cattle track Culvert needed 142/700 142/625 142/560 142/400 142/360 Construct open drainage channel across the rail to channel water safely size 500x400mm high 142/200 142/300 141/890 141/800 Culvert size 600mm diameter 141/570 141/500 141/445 141/340 141/340 140/550 Bridge 7.2m by 5.0m wide depth 8.3m 140/290 Culvert size 1200mm diameter 140/000 139/900 139/550 Viaduct bridge of 68m long over gorge

139/200 Culvert size 1100mm diameter Deposits of silt at the culvert entry Entry and exit of culvert bushy 138/770 Culvert size 450mm diameter 138/500 The area around there next to the line is bushy 138/465 Culvert size 450mm diameter, small Narrow entry mouth Water overflows to the rail washing sides of the carriage 138/330 Culvert size 1100mm diameter Narrow entry mouth Entry and exit of culvert bushy The area receive a lot of overflow 137/640 Culvert size 900mm diameter 137/615 Culvert size 900mm diameter 137/600 Culvert size 600mm diameter in 5pcs 137/595 Culvert size 900mm diameter 137/360 Culvert size 600mm diameter Culvert partly filled by the deposits Narrow entry mouth Entry and exit of culvert bushy 136/970 Culvert size 450mm diameter

136/450 Culvert size 450mm diameter Blocked by stones/boulders Narrow entry mouth 136/150 Culvert size 450mm diameter 135/935 Culvert size 600mm diameter Debris deposits inside the culvert Narrow entry mouth Entry and exit of culvert bushy 135/720 Culvert size 450mm diameter Culvert totally filled by deposits thereby not able to convey water through it 134/900 Culvert size 450mm diameter Narrow entry mouth Downstream drainage narrow hence prohibiting water flow 134/700 Culvert size 1100mm diameter 134/230 Culvert size 1100mm diameter twin Narrow entry mouth Scouring at the exit end of culvert 134/085 Culvert size 450mm diameter Culvert is 50% blocked Entry and exit of culvert bushy Downstream drainage narrow hence prohibiting water flow 133/900 Culvert size 450mm diameter Entry and exit of culvert bushy Narrow entry mouth

133/850 The area has much water and there is noticeable overflows over rail 133/730 Culvert size 450mm diameter Entry and exit of culvert bushy Narrow entry mouth 133/615 Culvert size 450mm diameter Narrow entry mouth 133/570 Culvert size 600mm diameter like in a manhole Exit end hanging loosely Formation being washed away by run off 133/550 Culvert size 600mm diameter twin Narrow entry mouth Lacks river training 133/360 Box culvert size 1000x 1000mm twin Formation being washed away by run off 133/300 Formation narrow and being 134/500 washed off along that stretch 133/300 Culvert size 1100mm diameter triple Narrow entry mouth 132/300 Formation narrow along that 132/600 stretch 132/350 Water overflowing the line 132/100 The area has much water and there is noticeable overflows over rail 132/050 Culvert size 1100mm diameter cannot contain that much water Entry and exit of culvert bushy 131/900 Drainage on the upper side is poor hence water overflow to Box Culvert needed and drainage channeled to it Culvert needed size 900mm diameter and drainage channeled to it

the line and washing off sleepers (tangi ya maji) 131/720 Culvert size 1100mm diameter 131/550 Accident area Culvert size 600mm diameter triple Box culvert size 1000x 1000mm Much water received coming with a lot of debris 131/470 Box culvert size 500x 500mm twin 131/415 Bushy along and next to the line Formation getting washed off Heap of murram next to the line poses risk 131/000 Culvert size 600mm diameter Formation being worn out by run off 130/900 131/000 130/900 Water flow over is great due to the drainage channeled towards the area 130/800 Water flow over is great due to the drainage channeled towards the area 130/660 Culvert size 600mm diameter The culverts to be replaced with a box culvert of size 2500x2500mm to contain the big water run off Culvert needed size 600mm diameter to reduce water flow downstream to improve on drainage Culvert needed size 600mm diameter to reduce water flow downstream to improve on drainage 129/640 Culvert size 600mm diameter 127/945 Culvert size 600mm diameter 127/060

126/700 Culvert size 600mm diameter 125/625 Culvert size 600mm diameter 125/000 125/100 124/200 124/450 124/310 Culvert size 600mm diameter Bushy entrance 123/450 Culvert size 600mm diameter Narrow entry and exit 123/400 Culvert size 600mm diameter twin Narrow entry 123/100 Bushy stretch along the rail line 123/200 122/950 Water flow over rail is noticed Culvert needed size 600mm diameter 122/835 Culvert size 450mm diameter, small 122/620 Culvert size 1100mm diameter Single Narrow entry mouth 122/550 122/620 Drainage poor hence water flow is not controlled passing over rail 122/200 122/350 Drainage poor hence water flow is not controlled passing over rail 122/200 Culvert size 1100mm diameter Single 122/100 122/200 121/650 121/750 121/665 Culvert size 600mm diameter

121/600 121/700 121/645 Culvert size 900mm diameter Single 121/000 Koora shopping centre **General* 120/650 120/500 Culvert size 600mm diameter 120/450 119/865 Box Culvert twin size 850x850 119/750 119/600 119/450 119/200 Culvert size 600mm diameter Twin Bushy entrance and surrounding 118/600 Culvert size 900mm diameter Twin 118/500 Culvert size 600mm diameter in quadruple 118/400 Culvert size 600mm diameter in quadruple 118/300 Culvert size 600mm diameter in quadruple 118/200 Culvert size 600mm diameter in quadruple 118/100 Culvert size 600mm diameter in quadruple 118/000 Culvert size 900mm diameter in triple 117/650 Culvert needed 117/500 Culvert needed 117/300 Culvert size 600mm diameter in triple 117/000

116/565 Culvert size 600mm diameter in twin 116/560 Culvert size 600mm diameter in 116/100 116/200 115/580 Open channel drainage size 1500x1200mm Culvert size 600mm diameter in twin 115/125 Culvert size 600mm diameter in triple 114/800 Culvert size 600mm diameter in twin 114/700 Culvert size 600mm diameter 114/410 Culvert size 600mm diameter 114/100 Culvert size 600mm diameter 113/985 Culvert size 600mm diameter 113/600 Culvert size 600mm diameter 113/350 Culvert size 600mm diameter 112/995 Culvert size 600mm diameter

112/485 Culvert size 600mm diameter 112/335 Culvert size 600mm diameter 112/040 Culvert size 600mm diameter 111/350 Culvert size 600mm diameter 110/625 Culvert size 600mm diameter 110/470 Culvert size 600mm diameter Another Culvert needed The following structures exists but much details are missing not comprehensive some sizes are just estimated 109/000 Open bridge 3m wide 108/500 600mm diameter culvert 108/300 600mm diameter culvert 107/600 1100mm diameter culvert 107/500 600mm diameter culvert 105/900 450mm diameter culvert 105/600 450mm diameter culvert 105/300 600mm diameter culvert 104/200 600mm diameter culvert 103/500 600mm diameter culvert 102/900 600mm diameter culvert 102/100 600mm diameter culvert 101/400 600mm diameter culvert 101/200 600mm diameter culvert 101/000 Open bridge 5m wide 99/900 600mm diameter culvert 98/200 600mm diameter culvert 97/100 Area with poor drainage 97/000 600mm diameter culvert

96/600 600mm diameter culvert 96/300 600mm diameter culvert 96/100 600mm diameter culvert 95/500 600mm diameter culvert 95/400 300mm diameter culvert 94/700 600mm diameter culvert 93/600 600mm diameter culvert 92/500 Open channel around 4m 91/400 600mm diameter culvert 90/000 Singiraini centre 89/880 Open channel 87/300 Open channel 86/700 300mm diameter culvert 86/000 600mm diameter culvert 84/900 81/000 Open channel 80/200 Long bridge elangatawuas river downstream 76/500 600mm diameter culvert 72/400 600mm diameter twin culverts 70/500 600mm diameter culvert 70/100 600mm diameter culvert 69/200 600mm diameter culvert 69/000 600mm diameter culvert 68/800 600mm diameter culvert 68/700 600mm diameter culvert 68/600 600mm diameter culvert 68/450 600mm diameter culvert 68/250 600mm diameter culvert 68/050 600mm diameter quadruple culverts 67/800 600mm diameter quadruple culverts 67/650 600mm diameter twin culverts 67/550 600mm diameter twin culverts 67/450 600mm diameter twin culverts 67/300 600mm diameter culvert 67/250 600mm diameter culvert 67/050 Area with poor drainage

66/950 600mm diameter culvert 66/925 600mm diameter culvert 66/700 600mm diameter culvert 66/400 600mm diameter culvert 66/275 600mm diameter culvert 66/150 600mm diameter culvert 65/400 Long bridge elangatawuas river upstream 64/550 600mm diameter culvert 64/025 600mm diameter culvert 63/750 600mm diameter culvert 63/350 Arched culvert 63/075 600mm diameter culvert 62/800 Arched culvert 62/450 600mm diameter culvert 62/400 600mm diameter culvert 62/100 600mm diameter culvert 62/000 Open channel 61/425 Arched culvert 60/900 Viaduct 61/100 60/400 600mm diameter culvert 60/050 600mm diameter culvert 59/750 600mm diameter culvert 59/550 600mm diameter culvert 59/300 Open channel 59/000 600mm diameter culvert 58/700 Open channel 58/600 600mm diameter culvert 58/300 600mm diameter culvert 57/650 Viaduct 57/900 57/150 600mm diameter culvert 57/000 450mm diameter culvert 56/500 600mm diameter culvert 56/300 600mm diameter culvert 56/200 600mm diameter culvert 55/800 600mm diameter twin steel culvert

55/550 600mm diameter culvert 55/200 600mm diameter culvert 54/800 600mm diameter culvert 54/500 600mm diameter culvert 53/900 600mm diameter culvert 52/600 600mm diameter culvert 52/200 600mm diameter culve 51/900 600mm diameter culvert* 51/600 Open channel 51/200 600mm diameter culvert 51/050 600mm diameter culvert 50/900 600mm diameter culvert 50/600 600mm diameter culvert 50/200 600mm diameter culvert Water overflowing to the rail 49/950 600mm diameter culvert 49/750 600mm diameter culvert 49/500 600mm diameter culvert 49/350 600mm diameter culvert 49/150 600mm diameter culvert 48/850 600mm diameter culvert 48/200 Open bridge 47/900 600mm diameter culvert 47/300 Bridge with ballast trough kajiado river 47/030 600mm diameter culvert 46/900 600mm diameter culvert 46/550 Arched culvert 45/900 600mm diameter culvert 45/300 600mm diameter culvert Completely blocked 45/050 600mm diameter culvert 44/800 600mm diameter culvert 44/100 600mm diameter culvert 43/350 600mm diameter culvert 42/000 KAJIADO STATION

38/ 600mm diameter culvert at olkajuado school 38/200 600mm diameter culvert 37/600 Open drain 36/100 600mm diameter culvert 35/800 600mm diameter culvert 34/500 Open drain 33/850 600mm diameter culvert 33/600 600mm diameter culvert 32/250 600mm diameter culvert 31/200 3.5x3.5m box culvert 29/000 600mm diameter culvert 28/300 Box culvert size* 27/100 600mm diameter culvert 22/700 600mm diameter culvert 22/550 600mm diameter culvert* 20/400 600mm diameter culvert 19/900 600mm diameter culvert 18/900 600mm diameter culvert 18/700 18/900 18/700 600mm diameter culvert 18/500 600mm diameter culvert 17/600 600mm diameter culvert 16/450 Open drain 15/050 Open drain 14/200 600mm diameter culvert 13/500 600mm diameter culvert 13/200 600mm diameter culvert 12/950 600mm diameter culvert 12/650 600mm diameter culvert 12/400 450mm diameter culvert 6/350 600mm diameter culvert 6/000 Open drain 4/380 Box twin culvert 2x1.5m 4/000 600mm diameter culvert 3/600 3/900

2/800 600mm diameter culvert 2/700 600mm diameter culvert 2/650 600mm diameter culvert 2/300 600mm diameter culvert 1/950 600mm diameter culvert 1/100 Open drain 0/000 KONZA STATION 4. NOTES FOR THE CONSULTANT The consultant s proposal should include the following in their technical proposal: a) A brief description of the firm and a record of recent experiences similar to the proposed study. b) A statement on the general approach that the consultant would take towards the execution of this work. c) The composition of the team that the consultant would propose to carry out the tasks together with individual CV s and the tasks which would be assigned to each. d) A time scale estimate chart showing the proportions of time for each tasks to be implemented. 5. DELIVERABLES a) Inception report This shall give a brief description of the consultants plan for the assignment, staffing, programme of executing the assignment and any appropriate remarks. It is to be submitted 14 days after the commencement date of the assignment. It shall be in three (3) copies.

b) Monthly Progress Reports This shall be prepared monthly by the consultant for the duration of the project which shall cover the progress made with regards to the output indicated in item 2. It should summarize the findings and recommendations of the consultants identifying any major delays or problems encountered in the project implementation. The report shall be in three (3) copies and should reach TCML not later than 10 days after the end of the month being reported. c) Draft Final report The consultant shall prepare a draft final report of the study which will cover the activities undertaken by the consultant throughout his assignment highlighting the findings made, computations and recommendations. It shall cover the full scope of the assignment. The report shall be submitted in three (3) copies not later than one month before the substantial completion of the assignment. The report will be inclusive of a book of drawings. d) Final report The consultants shall prepare a final report of the assignment. The report shall cover activities undertaken by the consultant throughout his assignment highlighting the findings made, computations and recommendations. The report will include observations and amendments made on the draft final report by the client. The report shall be submitted in five (5) copies not later than 30 days after the substantial completion of the assignment. The report will be inclusive of a book of drawings.

TECHNICAL SPECIFICATION FOR RAILWAY TURNOUTS 1. GENERAL All the dimensions and mechanical properties of the turnouts/crossings to be supplied shall not be less than those required in this specification. Track gauge is 1000mm 2. RAILS The rails used in the manufacture of the turnouts shall be 80R rails with the following specifications: a) Wear resistant rails with the following chemical composition; Element Phosphorous Sulphur Carbon Silicon Manganese Typical range, % 0.04% max 0.04% max 0.550.75% 0.1 0.50 % 1.3 1.7% b) Wear resistant rail with the following physical properties; Steel grade 900B, wear resistant quality. Tensile strength of not less than 880N/mm 2. Brinnel Hardness of not less than 261 BHN.

CROSSING NO SECTION OF RAIL RADIUS OF CURVE(m) TYPE OF SWITCH TYPE OF WING RAIL SWITCH ANGLE CROSSING ANGLE LENGTH OF STOCK RAIL(m) LENGTH OF TONGUE RAIL(m) HEEL DIVERGENCE(mm) CHECK RAIL (m) QUANTITY LEADING DIMENSIONS OF TURNOUTS REQUIRED DIMENSIONS IN METRES L A B C D F G H M 8.5 80R BS 141 Flexible curved 1 0 11' 37'' 6 0 42' 35'' 8.84 7.3 166.7 4.06 16.5 20.48 8.84 11.64 0.9 8.53 3.11 2.13 0.11 2 12 80R BS 289 Flexible curved 1 0 11' 37'' 4 0 45' 49'' 8.84 7.3 147.6 4.06 20.9 25.62 9.79 15.84 0.9 12.02 3.82 2.13 0.16 2