Re: Accumulator Car
The Bristol Road double 4 wheel bogie accumulator trams ran from 1890-1901, as has been said (with earlier trials of a battery locomotive 'The Julien', and then of the prototype for the service model decided on - the 52 passenger, nos 101-112.
No.113, was electrically equipped by the Electric Construction Corporation Ltd and was shorter and heavier than 114 - equipped to the designs of the General Electric Power and Traction Co Ltd. They were really trying to get them into service in late Summer 1892, but the permission from the Board of Trade was somewhat drawn-out, cpmplicated by the smaller size requiring the tramway company to check with the council whether they would allow them to carry outside passengers on cars without bogies. By December 1892, permission seems to have been granted (see Public Works Committee Minutes, Birmingham Archives). The National Archives has the BoT papers on the inspection (MT6/597/11) and approval of 113 and 114 - but see also the excellent and comprehensive paper of the late Mr John Stanley Webb on the life of the Bristol Road System
https://www.rhs.ac.uk/bibl/xSearch.asp?DATABASE=dcatalo&rf=900006352
Webb, J. S. 'Accumulator tramcars of the Birmingham Central Tramways'. Papers presented at the ... IEE Weekend Meeting on the History of Electrical Engineering, 11 (1983), 9th paper, pp.1-15. (typescript collection of individually paginated papers). Contacting the I.E.T. directly is perhaps the best way of accessing the paper which has excellent photographs from the extant ECC archives (where are they now!?)and details of 113.
I am more interested in 114 principally because of the G.E.P.&T. Co Ltd's involvement, and because it seems not to appear in any photographs and is hard to track down. Both cars had limited lifetimes on the road, probably because they didn't deliver the desired results - smaller, lighter cars (as compared to the other 12) were supposed to solve the battery traction problem in crowded thoroughfares, with more regular service and not having as many maintenance issues as the others which were over-heavy and designed by speculative constraints (similar to the cable car size specifications) rather than the needs of the storage battery system - not that it could have worked successfully under any system without being replaced after a few years of loss. I will dig out the dimensions and weight info for 113.
No.113
four wheeled car
Weight of car with motor etc - 6 tons and 10 cwt
Weight of batteries - 2 tons
Weight of both - 8 tons 10 cwt
Estimated running load (passengers) - 2 tons 2 cwt 2 grs
Total rolling load -10 tons, 12 cwt, 2 grs
Length of car - 18ft 4in
Length of inside - 11 ft 3 1/2 in
Width of car 6ft
To carry 16 inside passengers and 18 outside
The Managing Director of the Birmingham Central Tramways Co. Ltd, Mr William James Carruthers-Wain, was a proponent of electric traction - or indeed any means of reducing the costs of haulage and thereby increasing the profitability. Overhead lines were not permitted in the centre of town - being seen as unsightly; in 1895 and in 1900 attempts were made to replace the battery system, but they did not succeed because of the trolley wire issue.
The tale of the Bristol Road is not a happy one, the electrical companies made offers to the tramway Co for 'electric haulage', unfortunately the reality of maintaining lead-acid batteries for traction work was quite harsh - a destructive and damaging experience to man and machine alike. The handling of the plates and cleaning of the cells were particularly involved. The EPS, Epstein, and Chloride batteries were all given a go - Messrs Waller and Manville consulting engineers taking over the management on behalf of the tramway company after the ECC/EPS lost their contract. The Epstein company made much of the changeover to their wares, but the success of new cells only lasted for 6 months before renewals and damage to the coachwork told on the running costs. The unhappy mixture of electrical company and tramway staff managing an electrical experiment also worked against the organisation required for the success of the system, although technically the arrangements at the Bournbrook charging station were often celebrated as being very good in the early days.