The HO, C Track, C1 Track Extension Set consists of: 

- 2 no. 24172 straight track, 

- 1 no. 24224 curved track, 

- 1 no. 24611 left turnout, 

- 1 no. 24977 track bumper, 

- Instructions and a booklet containing C Trac plans. 

It comes in the original factory box and is used for adding a storage siding to the C Track starter sets as depicted on the box. 

I opened it once but never used it.

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