Such an interestic post on a topic that's been excercising my mind - or what's left of it
- for some time.
I agree with others here, and on Wikipedia, etc. that new liveries schemes were implemented when rolling stock went in for service, presumably locos every year or so depending on their use, carriages every two or three years, wagons up to five years, etc. - although somewhere I've seen seven years mentioned so I'm sure a bit of research into the practices of various workshops in histories, say of Crewe, Swindon, etc. might be a good source in info.
I think that for practical modelling it really dpends where you set the bar for yourself - unless you're exhibiting I suppose - there will be those who are happy with a 9F to be towing a GWR liveried autocoach alonside a sea of blue modern image trains - does anyone remember the 'Modern Image' debate raging on the letters page on the RM back in the early 'seventies? That nearly put me off the hobby for life! - and at the other end of the spectrum the 'Fine scale' brigade who won't tolerate any deviation from prototype and who, IMHO of course, are rather missing the point of a 'creative' hobby.
Like you I have amassed an embarrasing number of locos compared to the ambitions of my tiny - and as yet still unbuilt! - model railway - and of course the trains for them to haul. Like many folks I suppose I tend to seek engines that I particularly like - luckily my taste if for small tender englines, especially Moguls so you wont see any A4's thundering into my humble branch line terminus! - and in a livery version that I think suits them best. So for example I have sought and found a 14XX in 'late' lined Brunswick green livery so to me it's only right that it should be coupled to a marroon autocoach*. Others, e.g. the Ivatt Mogul, are in early lined BR black and by setting a date for the model - in my case September 1957 which is rather cute as that's when I was born
- that allows these variants to run reasonable comfortably together ...
Another personal bar is the supposed location and details of the model itself. I also happen to love the Drummnd LSWR designs and have recently found (as bargains at Hattons of course) an M7 and 0-6-0 goods engines, so a few Southern region carriages and wagons are in the wishlist. But I've already bought GWR based building kits and will fit GWR signals when I get to that stage. So how to reconcile that notoriously difficult customer, namely 'self'? Well although I'm a dab hand at spotting the provenance of locomotives¡s and set my standard that their trains have to be plausible I couldn't differentiate between a GWR or SW/LSWR signal if one fell on my head, nor the buildings really, and in any event I can always run a 'joint' line, even inventing a history to explain that when in reality company rivalries would make it unlikely - once again the 'fifties' are a source of plausible explanations - excuses?
- namely that even long before Beeching hundreds of stations were closed where they duplicated services to villages, towns and even cities ...
Regs
Simom
* in fact I bought the autocoah first as it was a bargain, at the time notbreally knowing much about the subletie so BR liveries, so then I waited and waited and waited for the green 14XX to turn up at Hattons, literally putting the cart before the horse!