I'm suffering abject brain failure regarding large parts of MRL's history, but it's always been part of Washington Industries. Owned by Dennis Washington, the firm started out as a construction contractor, and also owns CEECO, which paints (rebuilds?) locos, and eventually bought the carcass of Morrison-Knudsen. Despite M-K's long and storied history, after Bill Agee destroyed Bendix Corp, he moved on to bankrupt M-K by (among other bad moves) over-leveraging it in the new railcar business--which is why SuperSteel finished building Metra's fleet of new bilevels--and Washington Ind. added that to the fold.
Later, when CP Rail rationalized the old Soo, another rail subsidiary was formed to buy the Iowa grain lines, the Minneapolis-KC line, and the Chicago-KC line. This became IM Rail Link (or I&M Rail Link, I think). The "I" and "M" didn't necessarily stand for anything, because the system included Illinois, Iowa, Missouri, and Minnesota trackage. Despite its circuitous routing (vs. the UP Spine Line that it shared trackage with in the KC area), IMRL scored an early coup with traffic from Ford's Minneapolis plant down to NS's Kansas City Mixing Center (now operated by UPS, but that's another story), which was right next to the UP/IMRL and NS/BNSF junction--a curious place where four railroads crossed on two different joint lines; on the NS/BNSF line, NS owns the south track and BNSF the north; as a result, the mixing center and Ford's Claycomo lead are always chronically short of power switches because BNSF doesn't get any traffic out of the deal...
Anyway, from the rumors I heard, traffic didn't pan the way IMRL hoped, and DM&E was likely looking to unlock itself from UP's captive grip and paper barriers before coal started flowing. Washington Ind. unloaded IMRL, and IC&E was born. This is all midwestern and plains history, so's I won't bore you with no more....
I can't remember precisely, either, if MRL bought or leased its core route map from BN, but since 1987 its made a living as a captive bridge carrier ferrying BNSF trains around other, presumably more congested, parts of the BNSF system. I believe the carrier is non-union, and I recall right after startup, they wrecked one of their first BN overhead freights when someone--probably unhappy with a labor issue--turned it loose as a runaway out of a terminal.
Later, part of the old Livingston, MT, NP shop complex was cleaved off to form the Livingston Rebuild Center. In the early 90's, MRL took an old SD9 and rebuilt it to Dash-2 standards with a chopped nose, and shopped it around to see who might be interested, but I don't recall any takers. Anyone know what else LRC's done? I've sorta lost touch out here in the desert.
Anyway, I'll clear this channel for the next guy...