Motorway Marples was far too keen to sweep away the steam engine and modernise with dismals instead of allowing the standard classes to complete their working lives, - which as you say Frank was a dreadful waste of capital. I'm no economist (I could never balance my own cheque book) so I couldn't begin to argue whether or not dismals, - sorry diesels and DMUs made the best economic sense on minor lines, but certainly built for purpose engines like the 2MT's should not have been scrapped with such haste.
According to railuk.info, - 'These locomotives were the cheapest to operate on BR, as 16s 6d a mile in the mid-1960's - the same as a DMU, which replaced them'.
It's interesting looking at the engines that are available on the DLS and it's plain that content creators are just as bad as the preservation societies with there being large numbers of Pacifics in all their varieties and types and very little in the way of the more utilitarian classes of locomotive.
Built at Swindon 28/02/1953, withdrawn 13/10/1966 from 89c Machynlleth shed. Seems to have been a Cambrian lines engine. I have it on my list Mr Tailight.Re Class 2MT Mogul 46521 green livery worked al lot at Swanage last year when the line was operating.
I'd forgotten that they were called 'Brighton Tanks', - thanks for the reminder.You're right about the 4MTs Frank. The Standard Four Tanks worked the locals of the Midland and Southern Regions more than anything. They were so popular in Brighton that they gained the nickname "Brighton Tanks" from Southern residents that frequented the line. I'm a fan of the 3MT Tanks personally but it's impossible to discuss the 4MTs without talking about its definite Southern roots.