A modern high performance
The above diagram
shows the locomotive in its final post-FDC outline.
The diagram below shows it in its near-original outline with small tender
The present proposal
aims to deliver a brand new high-performance steam locomotive for the haulage
of high speed main line charter trains at the lowest cost, yet incorporating
features designed to maximise the return on the capital investment It will
be designed to 'state of the art' steam locomotive technology which guarantees
a level of performance far exceeding that of former steam, yet without sacrificing
any of the steam locomotive's rugged simplicity, nor its aesthetic appeal.
It is to feature the following general characteristics, so as to have the
highest level of acceptability to all sectors of the railway industry involved
in charter train operation.
The locomotive, excluding
the tender, is to be based on the size and format of the British Railways
Standard Class 5MT 4-6-0 design of 1951 (as described on the "73082
Camelot Locomotive Society" website at http://www.73082-camelot.com). The reasons for this are
Given the level of
power : weight ratio now possible in steam traction, it is an appropriate
size of locomotive for the intended duty of main line charter train service.
The deep firebox of
a 4-6-0 has, size for size, a higher evaporative capacity than a shallow
firebox boiler, and is ideally suited to burning oil or coal (using the
Gas Producer Combustion System). Basing the design on an existing one will
significantly reduce the design complexity, time and cost. All overall dimensions
constrained by the moving structure gauge being kept within those of the
BR Class 5MT will facilitate route acceptance.
A modest size locomotive
allows a large tender without exceeding the permissible length for turning
facilities, this in turn maximising the very important parameter of operating
range between supplies replenishment. The route availability is high - it
is a 'go-anywhere' type.
The relatively small
taper boiler gives good forward visibility from the cab, a factor of paramount
importance to safe operation at high speed.
The 4-6-0 is the quintessential
British locomotive type, for it was in Britain that the 4-6-0 was developed
more than anywhere else, and the Class 5 may be considered to be the quintessential
4-6-0. It is considered most appropriate to build on this, and the present
proposal will define the limit of performance for this type of locomotive.
* Note: 1 890 e.d.b.
kW at a constant 113km/h implies the haulage of a 1075 ton 29 coach train.
The ranges at both maximum power and under representative average service
conditions will therefore be greater than given with the trailing loads
more likely to be found in actual service (say 300 to 500 tons).
Last updated 15 Feb 2005 - Feb05 version of post-FDC drawing substituted