Definitely. A 2 car 155 was not a decent substitute for a 5 coach loco hauled rake on runs like Cardiff to Portsmouth - 160 seats instead of over 200 (with the armrests up in the compartments). The 2 car 158's had even fewer - 138 - though were (a bit) more reliable than the 155's. The philosophy spouted by the (then) Regional Railways management was that a more frequent service balanced the shorter trains. Problem was, routes like Cardiff to Portsmouth and Manchester remained hourly, same frequency as when loco hauled and more people will always travel at peak times.