684. SCHEMES UNDER CONSIDERATION BY COMMITTEE BUT NOT
YET SUBMITTED TO B.T.C.
1. Marylebone Suburban Service
(a) Submission of Scheme
Noted that departmental submission now received and sent to
L.T.E. and Western Region for agreement.
(b) Construction of units
Provision of additional 20 4-car sets not yet approved, but
agreed that C.M& E.E. be making preliminary arrangements for production
in anticipation of approval by the Commission of 1960 building programme,
and of the scheme itself.
(c) Type of power units
Mr.Pearson said that the Chief Mechanical Engineer had raised
the question of the additional 20 4-car sets being fitted with Rolls Royce
engines. The first 15 4-car sets were already authorised for operation
by B.U.T. 230 H.P. engines.
After considerable discussion it was the unanimous view of the
members of the Committee that the whole of the units for the Marylebone
scheme should be fitted with B.U.T. 230 H.P. engines, the reasons for the
decision being :-
(i) A good opportunity for comparison would be presented by
confining the Marylebone services to B.U.T engines and the St.Pancras
services to Rolls Royce engines.
(ii) The capital cost of Rolls Royce equipped vehicles
would be approximately £36,000 more than B.U.T., with increased
annual interest and renewal costs of £2,600.
(iii) Fuel costs for Rolls Royce engines is estimated at
£6,000 more per annum than B.U.T.
(iv) Two differing stocks of stores would require to be
kept.
(v) Care would need to be taken to ensure the two types could
be coupled together.
(vi) Very little experience had been obtained with Rolls Royce
equipment and maintenance and repair estimates had been based on a very
low figure.
