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We present four radio-loud NLS1 galaxies with extreme emission-line shifts,indicating radial outflow velocities of the ionized gas of up to 2450 km/s,above the escape velocity of the host galaxies. The forbidden lines show strongbroadening, up to 2270 km/s. An ionization stratification (higher line shift athigher ionization potential) implies that we see a large-scale outflow ratherthan single, localized jet-cloud interactions. Similarly, the paucity ofzero-velocity [OIII]$\lambda$5007 emitting gas implies the absence of a secondnarrow-line region (NLR) component at rest, and therefore a large part of thehigh-ionization NLR is affected by the outflow. Given the radio loudness ofthese NLS1 galaxies, the observations are consistent with a pole on view ontotheir central engines, so that the effects of polar outflows are maximized. Inaddition, a very efficient driving mechanism is required, to reach the highobserved velocities. We explore implications from recent hydrodynamicsimulations of the interaction between fast winds or jets with the large-scaleNLR. Overall, the best agreement with observations (and especially the highoutflow speeds of the [NeV] emitting gas) can be reached if the NLS1 galaxiesare relatively young sources with lifetimes not much exceeding 1 Myr. Thesesystems represent sites of strong feedback at NLR scales at work, well belowredshift one.

Extreme Gaseous Outflows in Radio-Loud Narrow-Line Seyfert 1 Galaxies