1989-1992 Overhaul
From 1989 to 1992, Morrison-Knudsen rebuilt the R46s through the GOH (General Overhaul) program, during which the fleet received the same LCD destination signs as the R44s and the blue stripes on the side of the cars were removed, resulting in the appearance of an entirely unpainted carbody (The fiberglass ends remain painted silver to match the stainless sides). Other improvements included the rebuilding of all mechanical systems, making the R46 more compatible with other car types. As a result of the overhaul, the fleet's reliability has vastly improved; the R46's Mean Distance Between Failures rate is much lower than the system average as of May 2011, and it is no longer considered to be the lemon that it once was.
Read more about this topic: R46 (New York City Subway Car)