The Curious Case of Class AC-7
This week's Saturday Timewatch goes back around 80 years to the 4-8-8-2 cab forward steam locomotives purchased by the Southern Pacific Railroad. 4151 is illustrated here as part of the Union Pacific Exhibition car. Similar earlier classes and a later version were also built, as well as the AC-7 illustrated above. However, all were designed with a cab forward configuration so that the engine crew were ahead of the steam exhaust through the miles of tunnels and snow sheds that were found across the steep mountain passes of the Sierra Nevada. It is over and through that terrain for which these hugely powerful locomotives were primarily designed.
The final survivor of the class, 4172, was scrapped in 1959.
The Curious Case of Class AC-7
This week's Saturday Timewatch goes back around 80 years to the 4-8-8-2 cab forward steam locomotives purchased by the Southern Pacific Railroad. 4151 is illustrated here as part of the Union Pacific Exhibition car. Similar earlier classes and a later version were also built, as well as the AC-7 illustrated above. However, all were designed with a cab forward configuration so that the engine crew were ahead of the steam exhaust through the miles of tunnels and snow sheds that were found across the steep mountain passes of the Sierra Nevada. It is over and through that terrain for which these hugely powerful locomotives were primarily designed.
The final survivor of the class, 4172, was scrapped in 1959.