 Records at the time, however, only show plans of steam-hauled cars being converted to trailers, single-ended driving trailers or single-ended motors of various lengths, with no double-ended variants.By 1914 a conceptual diagram had been drawn up showing double-ended composite motor cars, although no detail was given on utilisation of the vehicles if any were built.Without a guard lookout at the second driving end, the marker lights were to be installed in a canopy attached to the end of the curved roof clerestory.