"Richard J." wrote in message

Nigel Pendse wrote:
"Johnny Mo" wrote in message
om

No one has yet noted there are legal differences between sub-surface
stock ( district line) and tube stock (picc). To put a district
train thru a single bore tunnel would require a whole new fleet.
Tube (and WAGN class 313) need lengthwise evacuation, sub-surface
stock does not.

Inter-car movement on the D stock seems no harder than on Tube stock,
so is that just a question of carrying a (longer) ramp in the cab?
Presumably the fire resistance is much the same in all UG stock.

The District's D stock is the only one that still has wooden floors.
Hence they still carry fire extinguishers in the passenger areas,
whereas some more modern (or refurbished) types don't.

That's true now, but when this decision was made in the 1970s, all LU stock
had wooden slatted floors.