The Amtrak authorization passed in November provides $2.3 billion of much-needed capital support for the national passenger railroad. However, Amtrak had stated early on in its quest for capital funding that it required $3.75 billion to attain its Congressional mandate of self-sufficiency by 2002. The authorizing legislation itself now poses the question: "How will Amtrak get the remaining $1.4 billion?" As the railroad seeks answers, look for it to invest where it will get the biggest bang for the buck in its operating budget. That likely means good news for the Boston-New York high speed rail project, which has strong potential to attract new riders.Meanwhile, Amtrak president Tom Downs quit abruptly last week. The Washington Post said the Amtrak board pushed Downs out over dissatisfaction with the conduct of labor negotiations this fall. The board itself will be dissolved early in 1998 under the authorization agreement, which gives Congress a role in the formation of a new board. For info, National Assn of Railroad Passengers, 202-408-8362.