23 Models Tested on 1-4% Gradients - Too Steep?

I wanted to make sure my models will make it up my helix so did a bit of testing to see what percentage gradient they could handle.

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00:00 Introduction
02:27 Bachmann Thomas
03:08 Hornby Ruston 48DS
03:46 Hornby Smokey Joe
04:17 Hornby Peckett
05:03 Hornby Railroad Jinty
05:46 Bachmann Webb Coal Tank
06:44 Bachmann 1P
07:37 Oxford Rail Dean Goods
08:26 Hornby 4P Compound
09:22 Hornby Class 395 Javelin
09:52 Bachmann 94xx
10:39 Dapol GWR Large Prairie
11:14 Hornby Star Class
11:56 Hornby Class 73
12:36 Heljan AEC Railcar
12:56 Hornby LNER A4
13:50 Hornby 9F 'Evening Star'
14:18 Hornby Princess Coronation
14:51 Hornby Railroad Tornado
15:40 Hornby GWR Class 43
16:11 Bachmann Class 101 DMU
16:38 Hornby Class 67
17:05 Hattons Class 66
17:30 Results