Just after 7pm out, and 9pm back, exact times are on real Time trains. I doubt you will get access to dalmeny or north queensferry platforms, but there is a car park with a view of the bridge at north queens ferry, which is likely to be busy. Quieter spots with decent access and a good view will be dalgety bay out and rosyth back
Thanks. The timings didn't work for me so I didn't manage to see it. I did have an enjoyable day in S Queensferry though and the bridge was looking magnificent in the sun.