H&F RR No 166 sits on a siding in a corner of the Frederick Yard. No 166 was a Combine built for the Frederick RR H&F by Brill in 1910 and originally carried No. 31. At 43' in length with 32 seats she had Brill 27G1 trucks powered by four GE 88B (40hp) motors with K-288 controls.