Quote:->> This requires a lower ISO and a higher shutter speed, yes?>>
No to shoot handheld when the light is poor you need a 'higher' ie bigger number, ISO and a higher shutter speed. Anything that is moving , and that includes people , you need at least 1/125 sec or even 1/250 sec as a shutter speed. An ISO of 400 or higher would be needed for the sort of shots you are taking on your website.
You may be getting confused about taking better pictures in the dark using a tripod. Using a higher ISO ( like 400 800 or 1600 if the camera is fitted) will give a more 'noisy' picture, it will look less sharp.. With a tripod and in the dark , I would tend to drop the ISO to 100ASA, to get rid of as much camera digital noise as possible , and then change the fstop to something like f11 , f13 or more to get a large Depth of Field ( ie a good focus from one end of a Pendolino to the other , for example).. This will give me a shutter speed of 2 to 30 seconds and no way would you hold a camera steady for that.
I have tried to see what settings you used for the 4 pics above, but the exif info has got lost somewhere in the posting, probably the forum software.
The 180 shot:- as good as can be expected bearing in mind the weather- no problems photographically with that.
153344:- perfect.. the only slight 'defect' is the people on the stairs behind the DMU are blurred because they moved .. Had you waited 3 or 4 seconds they would ahve been behind the unit.. ( That's not a critism by the way)
66563 shot:- Perfect focus , Depth of Field etc, sky slightly 'washed out', but a pretty good effort. I could try and tell you how to recover some of the sky, but at the moment concentrate on getting all the shots as good as that, and you can learn to 'tweak ' them later.
The Voyager shot..Excellent- shot into the sun , but hiding it behind that bridge. Depth of Field - perfect, all other settings fine. Only slight problem is the trolley on the left moved... You should have increased the ISO to the next available , ie 200ISO to 400ISO , AND changed the shutter from 1/60th to 1/125 or more if possible.
Just my personal comments by the way, others may see an image entirely differently. You may have wanted the trolley blurred to indicate that it was moving..