Initial issues of the kit said 1/25 on the box and their website, which was supposed to be corrected to 1/48 (shows 1/48 on the instruction sheet), as per an email exchange I had when I bought the kit in Sept. 09, with Ernie Petit of Lindberg-they had 1/25th at the time on their website, which now shows 1/48. It is a reissue of the Hawk kit.
San Fran still uses them, so their transit website should be able to provide some reference photos.