Gentlemen,
I have never seen the original Lionel 249 one car set, however ron m points out in another thread, the original Lionel 249E train set, came with a complete 2600 consist. I have seen a couple of these 249-249E trains sets in the late 50's, early 60's and thought they were 264's until just recently. Evidently this was a Lionel 249-249E promotional set 6631EX.
Seafoid please post a picture of your 249 Train set, I would like to see the engine and Tender on that 248 Train set.
PCRR/Dave
The original Lionel 249 Engine and Tender, on the left, the Repro MTH P2 263E with Tender on the right.