UPDATE 2-Striking S.Africa truckers agree wage deal - RFA

* All four trucker unions agree wage deal - freight bosses

* Three-week strike had caused fuel, cash shortages

* Rand firms after announcement

(Adds rand, details) By Wendell Roelf

CAPE TOWN, Oct 12 (Reuters) - South African truck drivershave agreed a wage deal with employers to end a three-weekstrike that has hit deliveries of fuel, cash and consumer goodsin Africa's biggest economy, the Road Freight EmployersAssociation (RFA) said on Friday.

More than 20,000 truck drivers have taken to the streets inoften violent protests since late September, demanding higherwages. At least one person was killed and dozens of trucks weretorched by demonstrators.

"The parties have signed an undertaking that they agree to athree-year industry wage agreement which is to be signed atapproximately 10 a.m. (0800 GMT) on Friday," the RFA said in astatement.

All four transport unions were part of the agreement, RFAspokeswoman Magretia Brown-Engelbrecht said, although she didnot reveal details of the deal.

The rand , which fell to a 3-1/2 year low on Mondaydue to concerns about transport and mining strikes, firmed to asession high of 8.61 against the dollar shortly after the news.

Moody's also cut South Africa's government credit ratinglast month, citing the government's failure to tackle theindustrial unrest that has swept from the platinum and goldsectors into other parts of the economy.

The South African Transport and Allied Workers Union(SATAWU), which represents the majority of truck drivers, saidit was still consulting its members on the proposal and wouldcommunicate its decision at the meeting with employers.

Petrol stations have been experiencing delays of up to a dayin getting fuel and some have run completely dry, the SouthAfrican Petroleum Industry Association said on Thursday.

Other affected companies include logistics groups ImperialHolding , Super Group , Grindrod ,Barloworld and Bidvest .

Since August, almost 100,000 workers across South Africa,including 75,000 in the mining sector, have downed tools inoften illegal and violent strikes that undermined investorconfidence and already shaky economic growth.

More than 50 people have been killed in labour-relatedprotests in the last two months, including 34 shot dead bypolice at Lonmin's Marikana platinum mine onAug. 16.

South Africa is home to 80 percent of known reserves ofplatinum and the price of the precious metal has risenmore than 20 percent since the Marikana shootings, the bloodiestsecurity incident since the end of apartheid in 1994.

Striking gold miners rejected the industry's latest wageoffer on Thursday. Africa's top three bullion producers -AngloGold Ashanti , Gold Fields and HarmonyGold - have given them until Monday to reconsider.

(Additional reporting and writing by Agnieszka Flak; Editing byEd Cropley)

((agnieszka.flak@thomsonreuters.com)(+27 11 775 3154)(ReutersMessaging: agnieszka.flak.thomsonreuters.com@reuters.net))