Home road cars were predominant on the British Columbia Railway, particularly after 1975, but I do need a few other road freight cars. Having sourced a number of other road Canadian freight cars, I would now like to obtain a few U.S. road cars which may have been seen visiting northern British Columbia in the late 1970s. I am wondering if some of the modellers here for specific U.S. roads might be able to assist with suggesting suitable models for the following, as I do not have access to ORER sections for these roads, nor suitable reference books.
1. The following
CB&Q 47452 50' Double Door Box Car was photographed at Fort St. John in 1977:

Can someone identify the builder for me?
Can someone suggest a suitable model in N Scale?
If not available RTR, are decals available?
2. I would like to have a suitable
Milwaukee Road 50' Double Door or
Plug & Sliding Door Box Car. (Most cars sent to the BCR were double door cars so they could take lumber home, but most photos of Milwaukee cars I have seen were single door.)
Can someone suggest a suitable car series?
Can someone suggest a suitable model in N Scale?
If not available RTR, are decals available?
3. The following
Penn Central 267472 50' Double Door Box Car was photographed at Fort St. John in 1978. It seems to be lettered the reverse of what I have seen in photos with name and number at left and herald at right. Looks to be a 10'-0" inside height car?

Can someone identify the builder for me?
Can someone suggest a suitable model in N Scale?
If not available RTR, are decals available?
4. This St. Lawrence Railroad NSL 101256 Box Car was photographed at Fort St. John in 1977. Exactrail did a car in this scheme at one point but it is not the correct car. NARC will be releasing this scheme on their forthcoming 5077 car but it is also a different prototype. I may settle for the NARC car as it will have the door closer which is a neat detail, but am just wondering if there is anything closer. This is a USRE built car - is there a structural match in N Scale?

5. I would like to have a suitable
Union Pacific 50' Double Door or
Plug a& Sliding Door Box Car. in the aluminium and yellow scheme with map in the box logo.
Can someone suggest a suitable car series?
Can someone suggest a suitable model in N Scale?
If not available RTR, are decals available?
Again, we are talking 1977 or thereabouts, and I am looking for reasonably accurate models.
Any help appreciated,
Tim