wrote in message

On Wed, 17 Mar 2010 12:06:30 -0700 (PDT)
MIG wrote:
On 17 Mar, 17:44, wrote:
In article ,
() wrote:

On the central line this morning I saw a 6 car 92 stock train with
2 cars glued on the end to make up the 8. Why the unusual
configuration - an amalgamation of spare cars perhaps?

Sounds normal to me.

The 92TS comes in two car units, with a cab at one end or no cab,
just a shunting control cabinet. Are you saying you saw a cab in
the middle of the train? That would be quite within the standard
permutations.


Yes, four two-car units in every train, all fully reversible and able
to fit anywhere in the train.

A rough count suggests that there are 175 units with a cab and 165
without a cab, so there are bound to be some with cabs in middle
positions.

The 3rd cab wasn't in the middle, it was 2 cars from the end. Hence
the subject line. I'd not seen that configuration before - they're
usually in the middle.

Why are there extra cabs anyway? The 92 stock was always going to be
8 cars everywhere AFAIK. Are they just spares in case of failure?

Perhaps there was originally a plan to be able to run them to Ongar? In
that case, I assume 2 or 4 car units would have been used. Also, the
Drain uses 4-car 92 stock.