I remember this old Lehigh Valley sign well, back in the 60's. Until 1961 (when the LV abandoned all passenger service), H&M passengers could connect with the LV at Newark. Before April of 1967, the service to Newark was jointly operated by the H&M (later PATH) and the PRR. This was known as the "joint service", PRR tickets were used on this extra-fare operation; the cars that were owned by the H&M/PATH carried lettering proclaiming their ownership. The PRR-owned cars were lettered "PENNSYLVANIA"; the original 1911-era MP-38 "red mcadoos" were replaced in 1958 by the new "K"-class cars, the first production model air-conditioned rapid transit cars in the nation. Only the PRR-owned cars were equipped with cab signals, and, because of this, they were the only cars that could be positioned at the head of a train. PRR position light signals were used on this line during the "joint service" era. After 1967, the old "joint service" became a PATH-only operation, and PATH turnstiles were installed at Journal Square, Harrison, and Newark, for Newark passengers. The PRR position lights were replaced with traditional rapid transit-style color light signals. I have many wonderful boyhood memories of this unique and fascinating line.