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3690cs-b&o Chessie System B&O #3690...
The Baltimore and Ohio purchased 16 GP40's in 1966 (#'s 3684-3699).  The #3690 was delivered in November 1966 in the standard blue B&O scheme.  It was repainted into Chessie colors some time during the Chessie Era.  This unit went on to work for CSX as #6506.  The GP40, though not as numerous as the GP40-2, were quite common.  They were used with the GP35, GP38 and GP40-2 classes as first line freight locomotives for the entire Chessie era.

Below is a Dean Heacock pic of #3690.

How to make an Atlas GP40 #3690:
1.  This is an easy project.  Atlas does most of the work for you.
2.  The biggest problem here is that some of the parts are the wrong colors.  You will need to paint the ends of the uncoupling levers yellow instead of blue, the back sides and underneath the steps needs to be blue not yellow (it is basically unpainted by Atlas, you can see the area very clearly in the first pic below, just inside the back stair case, in the tunnel), the tabs on the bottom of the orange colored sill (right below the #3690 and one near the back) need to be blue not orange, the class lights (2 on the nose and 2 on the back need to be silver (they are unpainted by Atlas), and finally the mu stand.  It is visible just to the right of the drop step in the first pic.  It should have a red cap cover and the top should be yellow not blue.
3.  The bell is in the wrong position.  It is mounted low on the left side.  It should be side mounted high on the left side.  You will need a details west side hood mounted bell to be accurate.
4.  The battery boxcovers should have a slot in them.  Now you could cut and sand and try to get the Cannon detailed Chessie slotted battery box cover in there, but I just added a strip of black decal to mine.
5.  Weather the locmotive lightly.  I use C&O enchantment blue straight out of the bottle first.  Then, successively lighter shades (lightened with white paint).  I do very little weathering to the orange stripe or yellow body.  These tended to hide the wear and dirt well.  The trucks and fuel tank are always the first to get dirty.  Concentrate on this part.  Compare my pics below to see how weathering really changes the appearance.  Streak the bottom of the battery box with brown and black.  This is one of the few areas on all Chessie locomotives to be dirty.
6.  Tape over the windows and spray the entire locomotive with dull coat.
7.  Streak oily black (glossy sheen) onto the fuel tank to simulate spills.
8.  Add the handrails.  Weather slightly the parts where you would hold climbing the steps.
9.  You are done.  Enjoy your locomotive.

Below is a pic of my #3690 as it looked coming out of the box.

Below are two pics of 3690 without the nice layout backdrop.  I am working on this project now, so stay tuned for updates.

Below is an inwork pic of 3690.  Steps 1-4 have been done.  Compare with the pics above to see the subtle changes.  You can just see the bell behind the cab in the blue part.  The tabs are now blue, there is a "slotted" battery box, etc..

Below are two pics of the finished product.  Notice that the weathering has been done and the engine looks like it has seen some duty.  I didn't want this locomotive to look too grungy.  Some of Chessie's locomotives looked relatively clean.

Below is a close up of the nose of #3690.  You can really see the yellow top and red cap of the MU stand.  The tops of the cab and long hood have been drybrushed to bring out the detail.  Of note too is the way the walk ways have worn in the middles.  This is normal for a locomotive.