Weather conditions in Southcentral Alaska have caused some travelers along Alaska’s railroad system to have to reschedule their plans.

There were no roads or trains that reached Nome. Instead, officials shipped the serum by rail to Nenana in interior Alaska, some 675 miles (1,086 kilometers) from Nome via the frozen Yukon River ...

Harding in Nenana, Alaska, just days before he died in office, which marked the completion of the Alaska Railroad over a century ago. (Christie's Images via AP) ...