Who makes N Scale TOFC?

[The Dalles Hostler]

Have you considered Trainworx?

http://www.train-worx.com/ps85.up.htm
http://www.train-worx.com/ps85.trailertrain.htm

The UP prototype was built in 1959, as is the upcoming Trailer Train paint scheme. I have a couple of these, and they are very nice products.

[towl1996]

ultimate N scale seems to be exactly what I was looking for
thanks very much!

For the price may take me a bit longer to make up a huge train of them

You may want to just start with one, my underrstanding is they are warped and are difficult to straighten.  N scale kits is supposed to release an F39, which has been years now. 

[CodyO]

Thank you for the advice I`ll give one a shot and see how it is!

[nkalanaga]

Sirenwerks:  I have no idea.  I lived in Pasco, but never noticed these until I bought a copy of Morning Sun's NP Freight Color Guide.  That was all the information they had.  Their picture was taken in Seattle, so it's anyone's guess where they may have run under BN.

[pedro]

No one has mentioned Athearn's 53' offering:
http://www.nscalesupply.com/ATH/ATH-RS-Flatcars-40trailer.html