Pennsy train

Two things first:

-The PRR's only turbine (S2) was damaged in a grade crossing accident in mid-1949 and never used again, scraped in 1952.

- Finding a diesel that will run with your turbine (similar speeds for given voltage) may be difficult.  You did not give any detail on which one of the many that have been built by Lionel, MTH, Weaver, Williams, and 3rd Rail (traditional, conventional, command, etc).  Can not help much without having this data.

So, what era is your excursion train?  In January 1968 the PRR ceased to exist as it merged with the NYC and became the Penn Central.  In early 1976 the Penn Central went bankrupt and assets, as well as other roads', became CONRAIL.  In 1999 most of the PRR trackage went to NS.

So, assuming the S2 was repaired and kept for excursion service (fantasy), any appropriate "road" diesel would have these markings:

-Up to 1968: PRR

-1968 to 1976: Penn Central

-1976 to 1999: CONRAIL

-After 1999: NS

Again, finding a model diesel that will run successfully with your turbine will be the issue.  And, as always, it is your railroad so do what you want and have fun.

Ron,

We run DCS. So I will probably find a Penn Central. And thank you for the lesson.

David

Why not use a dummy diesel locomotive as a scale turbine would have more than enough scale tractive effort to pull most trains?  Whether PRR or PC, most likely passenger assigned locomotives would be given the task.  I would suggest one of the following:

• EMD E7 or E8:  These ran up until 1978 in the case of the E7 and the early 80's in for the E8.  The paint scheme would effectively be 5 stripe DGLE(Dark Green Locomotive Enamel) until 1952, 5 stripe Tuscan Red until officially 1955 (although many retained that scheme longer), wide stripe Tuscan Red until the merger (however, several got keystones on the side to replace the 16" Roman font lettering in the 1960's), and finally Penn Central post 1967 up through the formation of Conrail.  Any number of manufacturers have offered locomotives of these types.
• EMD FP7:  While most of these were painted for freight service in the thin stripe DGLE scheme, many lasted in service into Conrail.  PRR practice limited the actual passenger use of these locomotives as most saw mostly freight duties, however that could be a good pairing as a locomotive out of the freight pool makes sense for excursion service when the dedicated passenger diesels were required for mainline and branch line passenger operations.  3rd Rail offered these in 2014 in both Tuscan and DGLE schemes.  While not easy to find, there is a chance of 2nd run in the future.
• EMD GP7 (with steam generators and roof mounted air tanks):  PRR rostered three of these that were used mainly in commuter operations.  3rd Rail offered this configuration, but it is not a hard modification for any of the major manufacturer's versions without dynamic brakes.
• ALCo RS3 (with the high short hood):  Used mainly for commuter duties out of Pittsburgh but could be a good diesel assist for a fantasy S2 excursion train.  K-Line offered this unique "hammerhead" variant.
• ALCo PA or Baldwin passenger Shark:  These didn't survive into PC but could make for an interesting combination.  The PA's were gone by roughly 1960 and the Baldwins by 1964.  Lionel, MTH, Williams, and 3rd Rail have offered the PA, while the passenger sharks were only offered recently by Weaver and command a premium.
• GG1:  pick a paint scheme, any paint scheme.  Obviously would be under wire as many PC excursions with steam locomotives were done by PC in the late 1960's.  Pick a manufacturer, any manufacturer.

So in short, lots of realistic options should the PRR have decided to preserve and of their late steam locomotives.  It is of course fantasy, so there are no wrong answers, but if you want a flair of prototypical realism, you have lots of options.

How about an FM Erie-Built - readily available model from Atlas.