|NA "Tower" looking east in 2004|
|Plywood, fresh in 2004, would still be in place in 2014.|
By 2003 NA interlocking proper consisted of one facing point crossover, #18, one turnout to a station track, #16, paired signals on both main tracks protecting the switches, 17L/R and 19L/R, and a pair controlled approach signals, 15R and 21L, for the direction of travel on both main tracks. NA was used as a terminus of the DC area commuter rail services and therefore a station track and holdout were provided to facilitate these movements. You can see on the model board that the plant has at some point been altered.
The remote plant at Shenandoah Junction was controlled by a more traditional black GRS unit lever machine. The layout is similar with two crossovers and a side track that lead to the N&W connection. Signal levers were 7R/L and 9R/L, crossovers were #10 and #14 and the connecting track #8. Also panel blocking was fitted to this panel to prevent accidental wrong railing.
Back at NA interlocking we can see one of the original CPL signals mounted on a bracket mast while a Darth cantilever hovers ovehead.
In this view of the still open NA tower we see the CPL dwarf has already been replaced by a the dwarf still in use to this day as well as the crossover that was since removed with BYRD interlocking constructed as a replacement about 2 miles to the east.
Similar shot a few months later showing the other room in the tower used for relays or maintainers.
The dwarf stack is of the G/Y/L/R design for slow speed routes. Note the distant signals to BYRD interlocking in the background.
In this rear view of NA you can see where the arm-thick pole line cable bundles used to run into the tower. Also notice the radio antenna on the room, closest to the camera man.
Wider view showing the MARC platform (accessed by the station track) and the main tracks with a passing freight train.
View of NA from across the tracks while it was still open. Here you can see an interesting quirk of B&O interlocking towers. Sometimes they were not named for the interlockings they controlled. Here the name on the local relay hut is MARTINSBURG, not NA. VI in Connellsville suffered from a similar problem locked away inside the yard tower.
When I got there only the concrete mounting blocks remained of the MARTINSBURG relay hut.
Here is a 2004 view of NA (aka MARTINSBURG) interlocking sans crossover and with only a single switch to its name. At least the point heating elements seem to be effective.
Unlike many other towers, wooden ones especially, NA seems to live a rather lucky existence so far escaping both arson and the rampaging bucket of an excavator. I'll conclude with this shot of NA Cabin in 2008 looking back towards the station from Amtrak's Capitol Limited.