In the case of Temiscouata, options are not numerous for someone who wants to bash a plastic model. However, there is some hope.
Let's start with the basics. We know that between 1910 and 1914, Temiscouata only ran 1887/1888-built old 4-4-0 and brand new MLW 4-6-0. In 1911, they experimented with a 2-6-0 but found it unsuitable and traded it for a 4-6-0 few months later. It means only 3 types of locomotives can be modelled. Since the Connors Branch was devoid of any critical grade and traffic was light, most of the time they used the 4-4-0 on that line.
|Temiscouata #4 built in 1888 by Manchester (credit: Musée du Bas-Saint-Laurent)|
I'm not aware of any model that could be easily converted into a S scale 4-4-0 with 62" drivers. If you know of any, let me know, that could be a very nice project.
However, Jamie Bothwell point out that a 4-6-0 is available in On30. Made by Bachmann, this little locomotive can be converted to S scale using some conversion parts from NWSL. While not spot on, it can be modified to represent a decent model of a TMC 4-6-0.
|Temiscouata #8 as built in 1909 by MLW (Al Paterson Collection, "Canadian National Steam! Volume 4)|
Unfortunately, the real 4-6-0 had 51" drivers and 28" pilot wheels. According to what I've read, the Bachmann model, when scaled down to S, have 60" drivers and 32" pilot wheels. While, I can live with 32" pilot wheels or can easy change them for better, I'm not sure the same apply with the drivers. There's quite an important difference between a 60" and a 51" driver that can impact the overall look.
Would it be feasible to swap the drivers with new ones while keeping the original rods is debatable. Maybe some parts would require to be completely replaced with new ones. On the other hand, I could probably live with the discrepancies if the rest of the model is correct.
That raises a serious problem before moving forward. Actual dimension data about the Bachmann 4-6-0 is required to compare it with Canadian National locomotive diagram of ex-Temiscouata engines.
Once the driver swap is answered and dimensional data is known, it will be possible to decide how to make this possible or if other options must be evaluated. At this point, being totally newbie in that scale, I can hardly know about all locomotives available. Fortunately, I've got a lot of time ahead to find suitable power for the layout. Oh, and should I had it's a blessing not having to build up a large fleet! One loco and you're done!