OldModel

    public List<BakedQuad> getQuads(@Nullable IBlockState blockState, @Nullable EnumFacing side, long rand) {
        if (side != null) return Collections.emptyList();
        assert IExtendedBlockState.class.isAssignableFrom(blockState.getClass());
        Map<String, Pair<IModel, IModelState>> map = new HashMap<>();

        IModelState modelStateBase1 = new OBJModel.OBJState(
                Lists.newArrayList(OBJModel.Group.ALL), true,
                new TRSRTransformation(new Vector3f(.5F, 0F, .25F), null, null, null));
        IModelState modelStateBase2 = new OBJModel.OBJState(
                Lists.newArrayList(OBJModel.Group.ALL), true,
                new TRSRTransformation(new Vector3f(.5F, 0F, .75F), null, null, null));


        IModelState modelState0 = new OBJModel.OBJState(
                Lists.newArrayList(OBJModel.Group.ALL), true,
                new TRSRTransformation(new Vector3f(0F, 0F, 0F), null, null, null));

        IModelState modelState1 = new OBJModel.OBJState(
                Lists.newArrayList(OBJModel.Group.ALL), true,
                new TRSRTransformation(new Vector3f(+halfGauge, 0F, 0F), null, null, null));

        IModelState modelState2 = new OBJModel.OBJState(
                Lists.newArrayList(OBJModel.Group.ALL), true,
                new TRSRTransformation(new Vector3f(-halfGauge, 0F, 0F), null, null, null));

        map.put("slp0", Pair.of(TrackModels.sleeper24vx, modelState0));
        map.put("rl1", Pair.of(TrackModels.rail8vx, modelState1));
        map.put("rl2", Pair.of(TrackModels.rail8vx, modelState2));
        map.put("spk1", Pair.of(TrackModels.spikes, modelState1));
        map.put("spk2", Pair.of(TrackModels.spikes, modelState2));

        MultiModel combinedModel = new MultiModel(null, null, null, map);

        if (combinedModel == null)
            return Collections.emptyList();
        else{
            IBakedModel bakedModel1 = combinedModel.bake(modelStateBase1, DefaultVertexFormats.ITEM, ModelLoader.defaultTextureGetter());
            IBakedModel bakedModel2 = combinedModel.bake(modelStateBase2, DefaultVertexFormats.ITEM, ModelLoader.defaultTextureGetter());

            List<BakedQuad> list = new ArrayList<>(bakedModel1.getQuads(blockState, side, rand));
            list.addAll(bakedModel2.getQuads(blockState, side, rand));
            return list;
        }
    }