will this throttle work with a controlmaster 20 power pack

No, it is designed for use with the specified power packs.

Is this all you need to power your train/track

No, this is a throttle that can be used with the MRC 9900 and 9950 power packs. This item cannot be used by itself to control a layout.

Can this be used on a nce system?

It is not compatible with any DCC system. It is specifically designed for use with the MRC 9900 and 9950 DC power packs.

MRC - Throttlepack 9900/9950 Handheld - 0001325

Name: MRC Throttlepack 9900/9950 Handheld - 0001325
Brand: Model Rectifier Corporation
SKU: 500-1325
Price: 33.51 USD
Availability: InStock

Item Number: 500-1325

MSRP: ~~$49.98~~

You Save: 32%

Your Price: $33.51

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Scale: All

For use with the MRC 9900 and 9950 power packs.

Additional Product Information

Manufacturer/Brand: Model Rectifier Corporation
Mfg Part #: 0001325
Choking Hazard - May contain small parts. Not for children under 3 yrs.
Model railroad items are not intended for unsupervised children under 14 years of age.
UPC: 019571013258