Circa 1917-18, The lithograph is the same as the previous series, except of course it's red in color. The major change here is the trucks. Whatever type you might call these trucks they were the first variation of the same type that IVES used right up until 1930, except these ones have plain sides with no embossing. These same red cars are also found with the somewhat later embossed trucks (see example below).

Ives was never one to waste a part. Here they're using bodies already lithographed for a 550 series car on a frame that would probably date it to 1920-21

Another 550 on an 8-wheel frame, this one has the 1917 trucks with the smooth sides.

The example above is an 8-wheel 550 with a cutdown frame (1919?).

Circa 1922, just a color change. This variation comes in chocolate brown with an olive green roof.

Here's a hard one to explain, the frame and roof appear to be circa 1921-23, but the body is a 550 series body from approximately 1913. As was the case in 1913 only the baggage came in white, this car would have been sold with red 61 and 62 numbered cars. Some collectors claim this car is a fake made by other collectors, but original 550 series cars from 1913-14 would not have had any doors and would not have the slots punched into the sides for the door slide to attach to.  

Circa 1917-18. Red steel sided body with rivet detail and early smooth sided "M" style trucks (1917?). 

Circa 1918-19 - Still a mystery - IVES used some of the older 4 wheel frames and cut off the wings to make these extremely rare cut frame passenger cars. above is the green version below is a red version.

Another example of Ives using bodies already numbered as 550 series cars on 60 series bodies. These cars would have been sold in sets listed with 60 series cars. Circa 1920

Circa 1922. Chocolate brown body with olive green roof. Rivet detail, "M" style trucks that are embossed.

Circa 1917-18. Red with rivet detail, gray roof, smooth sided late series trucks.

Circa 1920-22. Leftover green 552 body on an 8 wheel frame, last series trucks with spring and rivet detail. 

Circa 1922. Chocolate brown body with rivet detail, green roof, last series trucks with spring and rivet detail.