On Apr 3, 8:09*am, "J Lynch" wrote:
"MIG" wrote in message

...
On Apr 2, 1:36 pm, wrote:

Sliding cab doors came in with 1973 stock I think. *Before that
(including 1960 stock) it was door handles and hinges, so nothing to
interlock.

C69 stock has sliding doors and pre-dated the 1973 tube stock..

Ah true, but nothing at the time of 1960 and 1967 stock. I was only
thinking tube.