The various modules are distributed around the railway. This table shows where they are:
| Location | Modules | Transformers |
| Fiddle Yard |
DAC20 1 (serial number 8) DAC20 2 (serial number 7) SIGM20 5 (serial number 64) SIGM20 6 (srrial number 65) BDL168 21 |
|
| Clanfield Station |
DAC20 3 (serial number 6) SIGM20 7 (serial number 277) MSC8 1 |
|
| Drop down panel under Petersfield |
DCS100; DB150 1; PM43 33,34; BDL168 22-24; DAC20 4 (serial number 5) |
DAC10 +24v; BDL168 +12v; PM42 +12v; SIGM20 +12v |
| Drop down panel under Eastleigh |
DAC20 5 (serial number 3) SIGM20 3 (serial number 325) SIGM20 4 (serial number 328) BDL168 25 |
DAC10 +24v; BDL168 +12v; SIGM20 +12v |
| Eastleigh (lift up section) | DAC20 7 (serial number 2) | |
| Portsmouth Station |
DAC20 8 (serial number 684) DAC20 9(serial number 685) DAC20 10 (serial number 465) SIGM20 1 (serial number 330) BDL168 28, 29, 30 TXC1 |
|
| Drop down panel under Portsmouth |
DB150 2; PM42 31, 32; BDL168 26, 27; DAC20 6 (serial number 4) SIGM20 2 (serial number 329) |
DAC10 +24v; BDL168 +12v; PM42 +12v; SIGM20 +12v TXC1 +18v |
The modules and drop down panels all have removable power connections so that they can be isolated and if necessary they can be removed from the railway. A 12 pin "chocolate block" type connector that splits into male & female halves has been used. The connections are standardised:
| Signal | Pins |
| Accessory DCC | 1,2 |
| DAC10 Aux Power | 3,4 |
| SIGM20 +12v power | 5,6 |
| BDL168 +12v Power | 7, 8 |
| PM42 +12v Power | 9,10 |
| Booster DCC feed | 11,12 |
| earth | 13 |
The lift-up section for Eastleigh has additional DCC power feeds:
| Signal | Pins |
| Zone B undetected DCC | 1,2 |
| Power feed B50 (25,1) | 3 |
| Power feed B51 (25,2) | 4 |
| Power feed B63 (25,3) | 5 |
| Power feed B64 (25,4) | 6 |
| Power feed M40 | 7 |
| Zone M return | 8 |