PRR Mikados were freight locomotives so the prototypical answer is "none."  But, since the goal of this hobby is to have fun, the 3-rail answer is "whatever you want."

I know the L1's were used for excursion trips so  18 inch heavyweight coaches would be appropriate.

Didn't Lionel just make PRR coal cars? That would work!

Jeff any PRR freight or passenger cars will look great. 

If you go the passenger car way I recommend some nice heavyweights. If you go with frieght I like the Atlas O Master Line Steam Age Classic box cars. I also know that MTH had a pack of War Bond PRR coal cars out a little while ago. They would look nice also.

Have fun!

In a discussion on another thread regarding N&W head end cars, I posted a reference to the nice Weaver N&W cars still on Public Delivery Track. Currently, there are 5 different PRR baggage cars. You could put together a very nice mail train with them if you wanted.

http://www.publicdeliverytrack...aver/s/10/Categories

Gilly

How about a mixed train like the railroads ran on branchlines? Half a dozen freight cars and a heavyweight combine on the end. I run trains like that behind a Consolidation, with a Rail King combine bringing up the rear.

On the bay check out these cars they would look really good.

MTH 20-4032 PREMIER PRR PENNSYLVANIA 5-CAR 70' MADISON PASSENGER SET

Hi Jeff

I am assuming we are talking about the scale sized PRR Mikado. Although the Mikados were used primarily in freight service, during the war years in the 1940s, a mikado or pair of mikados might be found at the head of a troop train or perhaps a pow train when axis prisoners of war were sent to camps in the US. I have seen photos of PRR Mikados on the LIRR's Bay Ridge Branch powering troop trains heading to the Brooklyn Army Terminal when our GIs were embarking to Europe in WW2.

So a string of PRR heavy weights 18 in cars form Lionel, MTH, K Line or Williams might look great . Golden Gate also sells  the PRR P-70 heavyweight coaches which are 21 inches in length and are scale models of rolling stock actually used during this period.

Mikados in branch line passenger service are entirely appropriate and realistic; I'm not real familiar with the PRR in detail, so I can't speak about it specifically. Real RR's wanted to

get the stuff or the people there, and were a lot less fussy about the necessaries than

many model railroaders.

After all, at the ends of their lives, NYC Hudsons could be found on work trains! (I have

photos.) 

The mikados were freight engines, so they did not normally do passenger service.   A K4 pacific was a regular passenger engine.

As mentioned above, they did do some excursions with them in the 50s and during the war, most like ran troop trains or POW trains.    HEavyweight cars.

The big difference, other than speed capability based on driver diameter, was the steam lines for heat.   Passenger engines had steam lines back through the tender that connected to the steam heat lines on passenger cars.   A freight engine did not have this ability on the PRR and most RRs.    Therefore the RR would not run them in regular passenger service unless there was a breakdown or emergency.

It is your RR, use it for whatever you need(often that is what they did on the RR)!

I would not hesitate to put a few of Lionel's Milk cars, a few of MTH's R50b reefers or express boxcars, and maybe a P70 coach from GGD at the end.

Something like these pics(sorry for the paper bag look, still learning scenery ). Never mind that one Milk car says "Grade    Milk" missing the "A" or that it is being pulled by a PRR RS-11(not pictured but built in the late late 50's and probably not used for pulling this type of train) and that the RS-11 is currently running  short hood forward(not usually how PRR ran them). This is what I needed to service a dairy and the local passengers on my RR, so it is what was used most recently.

Then again, about a dozen hoppers full of coal will look fantastic behind your Mikado!

HAVE FUN!

-Mike

I read this to see if the Pennsy, famous for the K-4, doubleheaded sometimes with

passenger trains, did like other roads, and ran Mikados in passenger service.  I'd like to see photos of that happening, say on a branch, and not in the special war or mail runs cited here.  The Pennsy had 4-6-0's and I am guessing they, common to a lot of short and branch lines' mixed trains  on other roads, were equipped for passenger service?  Somebody must have gotten a photo of a Pennsy Mikado trundling a passenger or mixed train up some branch?  If you find one, throw it up

on here...., please..  Another photo of interest would be a K-4 hauling a freight.