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Below is a list of photos at mileposts along the former Pennsylvania RR lines now part of Amtrak's Northeast Corridor (NEC) within Maryland. The mileposts mark the track distance from ZOO Junction in Philadelphia, Pennsylvania. Many of these photos do not appear in the PRR tour because they show nothing of particular historical note.

Many extant mile markers date to the 1902 merger of the Philadelphia, Wilmington and Baltimore Railroad (PW&B) and the Baltimore and Potomac Railroad (B&P) to form the Philadelphia, Baltimore and Washington Railroad (PB&W). These originals are prism-shaped and metallic, probably iron, with raised black digits on a white-painted background, though many have become quite rusty. The mileposts stand about 3 feet above the ground. To many posts Amtrak has affixed placards with larger digits arranged vertically; these larger digits express the same number as the originals under the placards. Almost all the markers are located on the north/west side of the tracks.

The photo links are named by approximate compass direction of their view. Unless otherwise noted, the trackside mile marker sign or post can be seen within the photo. The letter Y in the table's "Orig?" column means at last check the original PB&W marker was extant.

Over time I hope to fill in those missing from the table. Any comments? EMail me.

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