Hello , long awaited answer to replacement dcc board on  Proto's EMD E units  due out this spring . And much needed on Proto's older model of the E units " MRC 1902 " . I bought a set A B E-6's The A unit being powered had a 8 pin dcc plug but not much room for a sound or speaker , here is my E-6 987 with a mrc sound chip and 18mm slim speakers front and aft . Other problems  mars light will not work in dcc mode so I replaced it with brite LED .

Hello , I have been an HO collector for some 28 years now . Mostly Union Pacific Locomotives and rolling stock .