33. Locomotives. Thirty-nine 5,000 mile inspections, thirty-one 10,000 mile inspections, seven 30,000 mile inspections, three 60,000 mile inspec- tions, two 240,000 mile inspections and two 480,000 mile inspections were performed on the nine diesel electric locomotives. The engine lower main bearings and their thrust collars of locomotives Nos. 53 and 55 were renewed. Locomotive No. 56 was fitted with rebored cylinder liners and oversized pistons. Eleven cylinder liners and 12 pistons of locomotive No. 57 and 11 cylinder liners and 10 pistons of locomotive No. 58 were renewed. New compression rings were fitted to locomotives Nos. 52, 53, 54 and 55. Eleven traction motors were overhauled. Owing to the contin- uous development of cracks on bogies, locomotives Nos. 51 and 54 had one bogie plate holding the motor suspension bracket refabricated with inch steel plate. The harmonic balancer of locomotive No. 55 was rebuilt with new spring packs.
34. The availability factor of the diesel electric locomotives was 86.11% compared with 87.23% of the previous year. The slight decrease was attributable to the heavier maintenance and repair work, causing locomo- tives to be withdrawn from service for longer periods. With the arrival of an additional locomotive, it was possible to implement a more effective programme of maintenance and repairs although adequate motive power had to be made available at all times to cope with the increased volume of traffic throughout the year.
35. The maintenance cost of the diesel electric locomotives rose from $0.443 to $0.513 per km. The rise was due to the increased labour wages and the higher expenditure incurred on the replacement of parts during the year.
36. Carriages and Wagons. All carriages and wagons were maintained in an efficient state. In addition to routine maintenance and repair, the following rolling stock was overhauled and painted:
(a) Carriages Nos. 114, 116, 118, 204, 207, 211, 212, 307, 310, 314, 324, 325, 326, 327, 331, 332, 336, 339, 343, 344, 345, 346, 348 and 355.
(b) Thirty wagons of various types.
37. The undermentioned carriages were given an intermediate inspec- tion and repairs which comprised the machining of wheel tyres, the re- conditioning of electrical equipment and running gears:
Carriages Nos. 109, 111, 201, 202, 208, 211, 213, 300, 304, 305, 309, 312, 315, 321, 322, 324, 330, 333, 334, 335, 337 and 349.
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