As well as being assigned numbers, the Shoreliner railroad cars as operated by Metro North and the Connecticut Department of Transportation (CTDOT) have also been named. Shoreliner is the name of the Comet railroad cars operated by the two organisations. The CTDOT and Metro North pool their equipment, resulting in CTDOT equipment operating on the New York Hudson and Harlem lines, even mixed within a consist. The Comet II are Shoreliner Is, Comet III are Shoreliner IIs, and Comet IVs are Shoreliner IIIs. Both the Shoreliner IIs and IIIs have center doors. The IIs and IIIs can be told apart from each other because on the inside of the IIs the finish is a fake wood look and on the inside of the IIIs the finish is a gray color. The IIs and IIIs also differ because the III has no side engineers