Well if you are looking to model era3 DB then that does not include Prussia anymore.

I have several german train books but only one has a single photo of a BR24 - I will scan it and post here tomorrow.

Before the war they were used all over Germany but then mostly moved to during the war to Prussia due to low axle load and large supply (coal/water)

As for where they were posted in West Germany after the war, I have found this information:
https://www.drehscheibe-...ren/read.php?017,4239718

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So after 1945, 6 locomotives of the BR 24 (025, 026, 029, 060, 061, 062) remained in the RBD Karlsruhe (previously owned by the RBD Stuttgart). Of these, 24,062 were already sampled at Bw Tubingen in November 1945.
The others were partially parked, partly in the enterprise in the Bw Tubingen, Freudenstadt, Villingen, Rottweil, until they were delivered to the RBD Hamburg at the beginning of June 1946.

In 1945, the RBD Kassel was able to prove 9 locomotives of the BR 24, all of which were placed at Z-Bw Treysa on Z-24 006, 054, 064, 065, 066, 067, 068, 069, 070. They all came in March and June 1949 For reprocessing and then in other Bw.

In the RBD Regensburg two locomotives of the BR 24 (035 and 038), left in the Bf Neufahrn. They were released for disposal at the disposal of the PDB of 20.09.1948.

To the RBD Stuttgart 24 years see above at RBD Karlsruhe.

In 1945 the RBD Wuppertal took over the Bw Scherfede from the RBD Kassel and with it the 24 055, which was defected there and in 1949 to the RBD Cologne was delivered.

Operations of the locomotive in addition then took place only in the directories Cologne, Essen, Münster, Hamburg and to a very small extent in the direction Hanover. The focus here is clearly on Hamburg and Münster and, to a lesser extent, on Cologne.

Well all the Marklin BR24's in DB livery are from era3b with the DB cookie and triple lights.
Looking at the photo below, this is the same time frame and shows the BR24 stationed in Rahden.
If you plan to model Rahden, then the BR56.2-8 (Prussian G8) was also stationed there and the Franco-Crosti 50.40.
https://www.drehscheibe-...php?017,8073386,page=all

It all depends on how accurate and realistic you want to model that particular scene.
You could for example look for photos of Rahden and find the station and the BW layout etc. and look for similar/appropriate models.
If you want to be more flexible, I would consider the BR 86 and 64 would not look out of place if you wanted to use those models.