MYSTERY: Do not know maker & would like a caboose 2 match. . "patent applied for" is all it says

Very heavy cast steel. do not know anything about it other than it needs a caboose and I'd like to find the type that it should have. would like help identifying maker. Engine is 13.5" ....2 1/2" from out to out on wheels. coal tender is 9" with connecters extended. don't know if other cars are a part of it or picked up to go with it. very heavy cast and paint is real nice,Father-in-law picked up on East Coast. Any info would be most appreciated. Wheels on tender probably the tip off? caboose wheels should match i suppose.