please correct me, thanks a lot Today I traveled to Walton on Thames, after that I took the train back to Clapham Junction at 9pm, then I had to transfer Overground back to Imperial Wharf. The Overground staffs checked my Oyster card on my way back to Imperial Wharf, and they told me that I have to tap in at the Clapham Junction in order to take the overground. Obviously, I didn’t and I didn’t even realize. I accepted that was my fault, but I have to say it was not 100% my fault. Why don’t the Overground service set a checkpoint like most underground stations do. Or why don’t they just set a big sign which says PLEASE TAP IN HERE! OR 80 POUNDS WILL BE CHARGED! English is not my first language, it is hard for me to find the small sign. The two staffs didn’t charge me, which I was really appreciated. I explained a lot and finally they trusted me. But it was still made me so embarrassed. This letter was not about complain, but I would like to warn those people who might meet the same situation. And also, it won’t spent a lot of money for the Overground service to set up a checkpoint at the station, unless you are earning money by this way. Thanks. Kind regards