Hello, I know this is an old thread, but adding something I found, in case others have this question:
It appears that this adapter by Bosch is compatible with Festool OF1400 and OF1010:
Bosch Professional 1600Z0000G Adapters for The Fsn Ofa Guide Rail, for Use During Guided Routing with Bosch Fsn Guide Rails
https://www.amazon.com/gp/product/B00FLC4HCO/ref=sw_img_1?smid=AP3VA1GJZM3EQ&th=1
From the description:
Compatible with: Bosch GKF 600, GOF 1250, GOF 1600, GOF 2000 ; Festool OF 1010, OF 1400 ; Mafell LO 50 E; DeWalt DW 26203, DW 621, DW 622, DW 613 ; Makita RP 1110, RP 0900 ; Trend T4, T5, T10, T11; Perles OF3/OF9; Casals CT3000VCE ; Triton 1400W
My use case: I have Mafell and Bosch rails to go with my Mafell TS. I do not own any Festool rails (yet). I have both the OF1010 and OF1400, and would like to use the OF1010 on the rail (OF1400 pretty much lives inside the CMS table).
The adapter was on sale for $69 with free international shipping from Amazon UK. It will be here in 2-3 weeks. If anyone would like me to follow up and confirm that both the 1010 and 1400 are compatible, let me know.