Baltimore & Ohio (B&O) - Linking 13 - License Plate Boston came from the term "piggy-back"

came from the term "piggy-back"  which meant a trailer riding on a flatcar (TOFC)

Baltimore and Ohio Railroad and the Southern Railway

in which a runaway crude oil train killed forty-seven people and caused an estimated $200 million in property damage to downtown Lac-Mégantic

[3] WA&B also got the reputation for being the first industry in America to adopt half holidays on Saturday afternoons

Baltimore & Ohio (B&O) - Linking 13 - License Plate Boston came from the term "piggy-back"Baltimore & Ohio (B&O) Linking 13 License Plate 6" x 12" . 030 Gauge Aluminum Includes 4 Mounting Slots & 1 2" Radius Rounded Corners UV Protective coating to Prevent Fading Image is reproduction final product might differ slightly Made in America