| No. | In Service | Withdrawn | Condition |
| IS 1 | Converted from IA 11869 - 23 August 1971. Off register - 19 May 1978 | ||
| IS 2 | Converted from KT 344 - 30 June 1972. Off register - 28 April 1980. Scrapped - 4 July 1980 | ||
| IS 3 | Converted from KT 328 - 9 October 1972. Off register - 19 May 1978 | ||
| IS 4 | Converted from KT 343 - 20 October 1972. Off register - 13 August 1980. Scrapped - 5 September 1980 | ||
| IS 5 | Converted from KT 321 - 25 October 1972. Off register - 1979 | ||
| IS 6 | Converted from KT 361 - 30 October 1972. Off register - 1979 | ||
| IS 7 | Converted from KT 358 - 6 November 1972. Off register - 1978 | ||
| IS 8 | Converted from KT 349 - 9 November 1972. Off register - 24 June 1980 | ||
| IS 9 | Converted from KT 346 - 15 November 1972. Off register - 1978 | ||
| IS 10 | Converted from KT 339 - 25 November 1972. Off register - 1979 | ||
| IS 11 | Converted from KT 362 - 13 December 1972. Off register - 1980 | ||
| IS 12 | Converted from KT 340 - 13 December 1972. Off register - 1979 | ||
| IS 13 | Converted from KT 350 - 18 December 1972. Off register - 1979 | ||
| IS 14 | Converted from KT 363 - 30 January 1973. Off register - 1 December 1983 | ||
| IS 15 | Converted from KT 359 - 2 February 1973. Off register - 1979 | ||
| IS 16 | Converted from KT 348 - 12 February 1973. Off register - 1978 | ||
| IS 17 | Converted from KT 330 - 14 February 1973. Off register - 1978 | ||
| IS 18 | Converted from KT 351 - 21 February 1973. Off register - 1980 | ||
| IS 19 | Converted from KT 323 - 26 February 1973. Off register - 1 April 1981. Scrapped - 29 May 1981 | ||
| IS 20 | Converted from KT 334 - 5 March 1973. Off register - 1980 | ||
| IS 21 | Converted from KT 331 - 14 March 1973. Off register - 1980 | ||
| IS 22 | Converted from KT 336 - 15 March 1973. Off register - 1978 |