Recently I read a CCT special magazine "100 Years of Toy Trains, Electric Trains from A to Z". Under the letter K they had a write up on Kusan (also called KMT and Auburn and later maybe K-line) trains. The article stated that Kusan got a few years on Lionel on marketing Military and Space trains. Lionel did not market space train gear until the early 1960s
Kusan started in 1957 with the KF-110 Atomic Train shown below
Then came the KR-119 Satellite Train shown Below
The only Kusan car I have is the KMT 401098 USA Searchlight Car. The body was also sold as the PA 224 Generator Car, Space Research Car or U S Army K 806.
Mine came without the searchlight and I installed a flashing light and a plastic dome and a light on the operator and have made it into an Atomic Generator Car shown below.
It was not often that a train company beat Lionel at anything.
Charlie