Way before Lindsay Wagner started hawking the Sleep Number bed, New York Central Railroad had our number - the "Water Level Route"
and the dramatic lines of a train swooshing along the Hudson Valley at night. (pic courtesy of Period Paper, a great site).
New York Central Railroad, 1946
*and one large, detailed one from Wishbook on Flickr, Santa in a horrific near-collision D:
CAUTION: HUGE: 2908x3862