NCE N12SR Motor Decoder
The motor circuit is  rated at 1 Amp which makes it suitable for many HO engines with low current draw, especially useful where space is a problem.  It has 4  function outputs  and  is Silent Running.
 
Part Number: 05240119
Dimensions: 0.34" x 0.7" x 0.12" 8.6 x 18 x 3.2 mm
 
MSRP is $44.95.